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Short Form Specification
16mm Review Rooms and Reproducing Equipment
Amplifier Power Output:
10 w, 1% distortion 15 w, 2% distortion Over passband, 50 to 7000 cycles
Signal-to-Noise Level :
50 db below 10-w level signal from 400-cycle SMPT& standard level film
Frequency Response:
As given in SMPTE recommendations Uniformity of Scanning-Beam Illumination:
H db using SMPTE test film Flutter:
0.25% peak using SMPTE test film and RCA fieldtype flutter meter
Fig. 3. SMPTE specifications for reproducing equipment.
We, in the Navy, have problems that are somewhat different from those of the normal user of 35mm entertainment film in that the situation in which the film is reproduced is generally far from desirable. We, for example, exhibit film topside, where high ambient noises caused by exhaust blowers, noises of the ship underway and cross winds, all tend to force a limited dynamic range for optimum intelligibility. A further situation of reproduction which is quite common is that encountered aboard an aircraft carrier, where high ambient noise (80-90 db) results in the net end of masking low-level sequences completely and, unless the print is one of high intelligibility, preventing understanding of much significant dialogue.
As a basis for understanding the data on quality, we should first describe the type of equipment used in the screening room and the exact installation with regard to how the various measurements were made and how our data were ob
tained. This equipment is the standard Navy 16mm IC/QEB projector set (Fig. 1), manufactured by the De Vry Corporation and designed to conform to the requirements, regarding its frequency-response characteristic (Fig. 2), as set forth by the 16mm Subcommittee on Sound Reproduction (Fig. 3). It has a power-output capacity of 20 w at less than 2% distortion over the passband of frequencies (Fig. 4). The frequency-response and tone-control characteristics of the amplifier are shown in Figs. 2, 5 and 6. Similarly, the portable loudspeaker frequencyresponse characteristics are shown in Fig. 7.
In order to evaluate prints as to dynamic range, we utilized a second amplifier which was bridged directly across the sound output from the two projector sound heads. The function of this second amplifier was to operate the volume-level indicator which is incorporated in a still projector and is
Orr and Cowett: 16mm Release Quality
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